Diplopia
Detailed examination reveals no obvious extra ocular muscle weakness.
Diplopia is due to failure of fusion of images.
Types of diplopia : There are two types
- Binocular
- Uniocular
Uniocular
- Diplopia that persists even when patient closes one eye.
- Diplopia improves with pin-hole
What are the causes of Uniocular
- Ocular causes: Example : Refractive errors
- Occipital lobe lesions
- Functional cause
Binocular
Patients with diplopia may not always have the issue of double vision.
What are the causes of Binocular
- Diplopia is due failure of fusion of images.
- Normally fusion can occur only when the images fall on corresponding
- parts of the retina and when the images are similar.
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